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    <h1>Shell</h1>
    <p>推荐阅读 <i>William Shotts</i> 编写的 <a href="https://linuxcommand.org/tlcl.php" target="_blank">The Linux Command Line</a>，作者提供 <a href="https://sourceforge.net/projects/linuxcommand/files/TLCL/19.01/TLCL-19.01.pdf/download" target="_blank">pdf</a> 下载。</p>
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